﻿Only <em>IfcStyledItem</em>'s (or subtypes) are allowed as members in the list of <em>Items</em>, inherited from <em>IfcRepresentation</em>.
<blockquote class="change-ifc2x3">IFC2x3 CHANGE&nbsp; New where rule to ensure the usage for material definition representations, and other non-shape representations</blockquote>
